Transformation of 4??(1??dimethylaminoethylidene)??2??phenyl??5 (4H)??oxazolone into methyl 2??benzoylamino??3??oxobutanoate. The synthesis of 1??substituted 4?? …
…, AŠ Hvala, B Stanovnik
Index: Bratusek, Urska; Hvala, Ales; Stanovnik, Branko Journal of Heterocyclic Chemistry, 1998 , vol. 35, # 6 p. 1281 - 1284
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Citation Number: 16
Abstract
Abstract Methyl 2-benzoylamino-3-oxobutanoate (3) was prepared from hippuric acid (1) which was converted with N, N-dimethylacetamide and phosphorus oxychloride into 4-(1- dimethylaminoethylidene)-2-phenyl-5 (4H)-oxazolone (2) followed by hydrolysis with hydrochloric acid in methanol. Compound 3 was treated with hydrazines 4 to give 4- benzoylamino-3-methyl-1H-pyrazol-5 (2H)-one (6a) and its 1-substituted derivatives 6b-j. ...
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